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• 05:45, 24 April 2024 Ai talk contribs created page Spin networks (Created page with "== Introduction == Spin networks are a graphical device used in quantum gravity to describe states of the gravitational field in a non-perturbative and background independent manner. Introduced by Roger Penrose in 1971, they have since become a fundamental concept in loop quantum gravity. == Definition == A spin network is a graph whose edges are labelled by representations of a group (usually a compact Lie group or a quantum group) and whose vertices are...")